• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.04a
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• pp.198-202
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• 2003

Tunable laser diode module with 50GHz-spacing internal wavelength locker was developed. Angle tilting dependency on FSR and peak wavelength shift and the proper initial tilting angle was calculated. By tilting the etalon, the response of the internal wavelength locker module was tuned. As a result, the fabricated internal wavelength locker module showed good performance over 62 channels.

• Journal of the Optical Society of Korea
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• v.8 no.2
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• pp.55-58
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• 2004

Several internal wavelength locker schemes for 10 Gbps electro-absorption modulated laser EML) module were reviewed. 10 Gbps EML modules with simple and robust internal wavelength ockers for metro dense WDM application were successfully demonstrated. The wavelength aging ver 2000 hours was done at elevated temperature of 7$0^{\circ}C$. The average wavelength drift of 10 modules was measured to be about $\pm$ 5 pm. These modules can be successfully applied to the 0 Gbps DWDM systems with 50 ㎓ channel spacing.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.504-508
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• 2000

본 연구는 WDM(wavelength-division-multiplexed) 전송 시스템에서 안정된 파장의 광 송신기를 설계하고 구현하기 위한 것이다. 기본적으로 광 출력의 안정성을 위하여 10uA 미만의 안정성을 갖는 정전류 회로를 설계하려 했으며, 출력되는 광의 파장은 Wavelength Locker를 이용 에러신호를 검출하고, 이 신호로 레이저 다이오드 모듈 내부의 온도를 제어하여 파장을 조절하였다. 최종적으로 이들은 A/D, D/A 컨버터와 $\mu$-Processor로 구성된 마이컴 회로를 통해서 제어되도륵 하였다. 또한 마이컴 회로는 송신기가 WDM 전송 시스템에 장착되었을 때의 시스템과의 인터페이스를 위한 신호들을 출력할 수 있도록 하였다.

• Korean Journal of Optics and Photonics
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• v.13 no.5
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• pp.384-389
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• 2002

A new idea of the wavelength locking module for DWDM application was investigated in the present research. Only one etalon photo-diode is generally used in the internal/external wavelength locking system. For the internal wavelength locking module with 50 GHz applications, an algle tuning method of the etalon commonly applied. However, the alignment process of the etalon with the angle tuning method is limited because the lock performance is extremely sensitive accoriding to the change of the tilting angle. In an optical viewpoint, the alignment tolerance of the locker module with the etalon PD array block was good, and the precise tuning of the wavelength was possible. The characteristics of free spectral range (FSR) and peak shift of wavelength according to the tilting angle with the locker module was investigated. For the present module, the optimized initial tilting angle was experimentally obtained.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.4
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• pp.699-704
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• 2003

This paper has been studied about the design of optical transmitter with stable output wavelength in WDM transmission system. The stabilized constant current circuit is designed with deviation less than 10$\mu$A. The temperature control circuit is constructed for the control of internal temperature of laser diode. Also, the wavelength locker is used in optical output. Finally, A/D, D/A converter and micro-processor are used for the control of these.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.543-551
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• 1999

본 연구는 광 전송 시스템에 레이저 다이오드의 안정되고 고정된 출력 파장의 광원을 제공하기 위한 것이다. 레이저 다이오드를 구동하기 위하여 안정된 정전류 회로를 설계하려 했으며, 레이저 다이오드 자체의 온도센서와 TEC(Thermo Electric Cooler)를 이용하여 레이저 다이오드 내부의 온도를 제어하는 온도 제어 회로를 구성하였다. 또한 광 출력에 Wavelength Locker를 이용하였다. 최종적으로 이들을 제어하기 위하여 A/D, D/A 컨버터와 마이크로 프로세서를 사용하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.3
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• pp.581-590
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• 2001

This paper has been studied about supply of optical source of laser diode with stable and uniform output wavelength in optical transmission system. The stabilized constant current circuit is designed. The temperature control circuit is constructed for the control of internal temperature of laser diode. Also, the wavelength locker is used in optical output. Finally, A/D, D/A converter and micro-processor are used for the control of temperature.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2006.05a
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• pp.74-77
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• 2006

A scanned Fabry-Perot(F-P) filter and a Multi-Channel Wavelength Locker(MCWL) were used to interrogate fiber Bragg grating sensor array. When the F-P filter scans over the MCWL which works as a multi-reference the temporal peaks profiles correspond to the locking wavelengths. To solve the linearity, stability, and accuracy problems caused by the nonlinear response of F-P filter, a polynomial fitting algerian was used to calculate the relationship between the peak locations and the wavelengths in all the scanning range. Then from the reflected peaks locations and the best fitting line, the Bragg wavelengths can be obtained. The measurement linearity was greatly enhanced with wavelength resolution of about 4 pm in 10Hz scanning frequency.

• Journal of the Optical Society of Korea
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• v.3 no.2
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• pp.51-54
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• 1999

A Nd:YLF laser has been actively mode-locked at the third-order harmonic cavity frequency using a lithium niobate phase modulator. Self-oscillating pulses of 14 ps duration, 1 GHz repetition rate, and 10mV average power at 1053 nm wavelength have been obtained. A 1GHz rf signal to drive a phase modulator was obtained by using 1GHz pulse train without rf synthesizer as a driver of an active mode locker.